OnInitialization 
OnInitialization
OnInitialization
runs after OnRequest. It retrieves and prepares data for the layout and can also perform calculations.In our example, OnInitialization contains the following program code:
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DATA: line_item TYPE bsbasket, item_detail TYPE bsbookdata, catid_tab TYPE catid_tab, psubtotal TYPE bscurr.
IF application->m_basket IS NOT INITIAL. LOOP AT application->m_basket INTO line_item. IF line_item-qty > 0. append line_item-catid to catid_tab. ELSE. DELETE application->m_basket. ENDIF. ENDLOOP.
SORT catid_tab. DELETE ADJACENT DUPLICATES from catid_tab.
CALL METHOD cl_book_shop=>get_items EXPORTING catid_tab = catid_tab IMPORTING bookdata = bookcat_tab.
* calculate total price LOOP AT bookcat_tab INTO item_detail. READ TABLE application->m_basket WITH KEY catid = item_detail-cata_id INTO line_item. psubtotal = psubtotal + ( item_detail-our_price * line_item-qty ). ENDLOOP. totalamount = psubtotal. ENDIF. |
If the shopping basket contains items, the catalog IDs of the items are stored in the table catid_tab. This table uses the method
cl_book_shop=>get_items to get the required book data and write the data to the internal table bookcat_tab (see Page Attributes).Next, the application calculates the total price of the books in the basket. This figure is then output in the
Layout.